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Oiles Drymet ST Oil-impregnated polyacetal multi-layer bearings with back metals Press-fitting (Rolled bushing) Housing chamfer For the housing chamfer, either a round chamfer or a tapered chamfer is recommended. In case of a C-surface chamfer, (more than C1.0) make sure there is no burr. Smoother press-fitting is possible by applying small amount of grease or lubricant. Press-fit force Press-fit smoothly with hydralic (pressure), pneumatic pressure, or a vice. Avoid press-fit by use of impact such as use of a hammer. It might induce damage of the bushing, or change the size of the inner diameter after press-fit. Fi0.9 to 1.2j~104E@D@@kkgl 1 tELES Backing steel thickness F thickness of the steel backing F length of the bushing F average interference F O.D. of bushing t L S D1 I.D.of bushing Up to ƒÓ18 ƒÓ19 to ƒÓ25 ƒÓ26 to ƒÓ40 ƒÓ42 and over ƒÓ42 t 0.5 0.95 1.38 1.88 Unit : mm Press-fitting jig Generally, as shown in the figure 1, a mandrel is used for the press-fitting. However use of a guide ring facilitates easier press-fitting. Use of a guide ring prevents damage of a bushing at the time of press-fitting. The dimension of a guide ring should be calculated from the table below. Inner diameter of the guide ring should be the size so that the bushing can be inserted by hands. Length of the guide ring should be more than one-third of the bushing, or if possible, it should be the same length as the bushing. Dimension of bushing I.D. D0 O.D. D1 Length L Dimension of mandrel d0D0|i0.05 to 0.10j d1D1|i0.20 to 0.30j R†L The dimension of mandrel should be calculated from table below. Load Load Mandrel Bushing Guide ring Housing Regular press-fitting Press-fitting with guide ring L R D0 d0 d1 D1 D1{i10 to 15j C1.0 Inner diameter of the guide ring should be the size that bushing can be inserted by hands. The length of the guide ring should be more than one-third of the bushing, or if possible, it should be the same length as the bushing. The dimension of guide ring should be calculated from table below. Dimension of bushing Up to ƒÓ40 ƒÓ42 to ƒÓ60 Over ƒÓ65 Guide ring O.D. D1{i10 to 15j Guide ring I.D. D1{i0.1 to 0.3j D1{i0.2 to 0.5j D1{i0.5 to 1.0j Press-fit force is obtained by below formula. Figure 1 Figure 2 Figure 3 139Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter